React
A JavaScript library for building user interfaces with reusable components. Created by Meta, powers Facebook, Instagram, and thousands of apps.
What is React?
React is a JavaScript library for building user interfaces with reusable components.
Instead of writing one giant app, you break your UI into small pieces (components) that manage their own state and can be reused anywhere. React handles updating the DOM efficiently when your data changes.
Most modern web apps use React because it makes complex UIs manageable. You can start with Create React App or jump straight to Next.js for a full framework. The ecosystem is massive with solutions for routing, state management, and pretty much anything you need.
Free and open source. Over 220,000 stars on GitHub. Learning curve is real but worth it if you're building anything beyond a landing page.
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Related Terms
A web app is software that runs in your browser instead of being installed on your device, accessible from any computer with internet.
A utility-first CSS framework that lets you style websites by adding pre-built classes directly to your HTML instead of writing custom CSS.
Next.js's file-system based routing that uses React Server Components for faster, more flexible page navigation and data fetching.
The programming language that runs in web browsers, making websites interactive and handling everything from form validation to real-time updates.
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